Trackball for computer



FIG. 1 is a top front and left side isometric view of a trackball for computer showing our new design;

FIG. 2 is a bottom front and right side isometric view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view thereof;

FIG. 7 is a rear elevational view thereof;

FIG. 8 is a top front and left side isometric view of a second embodiment of our new design;

FIG. 9 is a top plan view thereof;

FIG. 10 is a top front and right side isometric view of a third embodiment of our new design;

FIG. 11 is a bottom front and left side isometric view thereof;

FIG. 12 is a bottom plan view of the second embodiment shown in FIG. 8;

FIG. 13 is a rear elevational view thereof;

FIG. 14 is a right side elevational view thereof; and,

FIG. 15 is a front elevational view thereof.

The cord is shown in broken lines in the figures for illustrative purposes only and forms no part of the claimed design and the rear elevational view of the third embodiment is similar to the rear elevational view of the second embodiment shown in FIG. 13. 

The ornamental design for a trackball for computer, as shown and described. 